Brush-holder for dynamo-electric machines.



No. 784,102. PATENTBQD MAR. 7, 1905. J. BURKE.

BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED MAY 3, 1904.

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UNTTED STATES Patented March '7, 1905.

PATENT OEEIcE.

JAMES BURKE, OF NEW YORK, N. Y., ASS IGNOR TO BURKE ELECTRIC COMPANY, ACORPORA ION OF NElV JERSEY.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 784,102, dated March*7, 1905,

Application filed May 3, 1904. Seriill I '7- To all whom, it nutyconcern:

Be it known that I, JAMES BURKE, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in Brush-Holders forDynamo- Electric Machines, of which the following is a full, clear, andexact specification.

My invention relates to dynamo-electric machinery, and particularly toan improvement in brush-holders. I

The object of my invention is to produce an improved brush-holder simplein construction and of such a design that all the parts may be readilyand easily manufactured and assembled.

By my invention the brush-stud is preferably threaded, and mounted toturn thereon is a supporting member for each brush. These supportingmembers are adapted to be punched from sheet metal. 1 also provide asupporting-plate, which may be made from sheet metal in a similarmanner.

My construction furthermore includes means for regulating the pressureof the brushes upon the commutator, which brushes may be convenientlyraised therefrom for the purpose of cleaning, renewal, &c.

The details of my invention will be understood ifrom the followingdescription and accompanying drawings, which show the preferred form ofmy invention, and the novelty thereof will be definitely set forth inthe claims.

Figure 1 shows a plan view of my improved brush-holder. Fig. 2 shows aside view thereof; Fig. 3, a side view of a modified form; Fig. 4, anend view of a commutator of a bipolar machine, showing the brushes intheir relative positions; and Fig. 5 shows an end view of a brush-holderwith the brush-stud secured to the brush-ring, such as is commonly usedin multipolar machines.

Referring to Figs. 1 and 2, the brush-stud 1 is carried by a plate 2.This plate is provided with two ears 3 at right angles to the mainportion of the plate, the said ears serving to support'the stud 1, whichis held in place by. the screws 4. Upon the stud 1, which is in thisinstance threaded, as shown, are

mounted the brush-supports so as to turn thereon. These are preferablystamped and formed into a U shape from shectmetal. The arms 5 of eachsupport have threaded openings at their ends for the stud 1, and thebrush 6 is secured at the opposite end of the support to the part 7 atright angles to the arms by the screw 8 and nut 8. The brushes are shownwith converging sides and overlap each other.

The arms 5 are provided with notches 9, which are engaged by a pin 10. Aspiral spring 11 engages the pin 10 and is insulated by sleeve 10 toprevent current passing through the spring and is secured at theopposite end to the plate 2, thus exerting a downward pull upon thebrush. The brushpressure is regulated by moving the pin 10 to differentnotches 9 at a greater or less dis tance from the axis of thebrush-stud. Each of the arms 5 has one corner, 5, rounded and onecorner, 5, square, so that in case ofbrcakage of the spring or at anytime when the spring is disengaged the support and its brush may bethrown or turned backward to a definite position and prevented fromfalling in contact with the commutator or frame of the machine.

In Fig. 2 the brushes are shown at right angles to the arms 5; but it issometimes more convenient to incline the brushes with reference to thearms, as shown in Fig. 3. The latter form is also shown in Fig. T, inwhich the commutator is indicated by the circle 12. The parts 13 extendfrom the end bracket of the machine, and the brush-holders are securedthereto by means of bolts lei, which pass through holes 15 in the plate2, the brushholders being insulated by a sheet 16 and bushings ofsuitable material.

Fig. 5 illustrates a construction adapted for machines in which abrush-yoke or support ing-ring is used, such as is common in multipolarmachines. The construction is in general the same as above describedexcept that the stud 1 forms the main su pport for all parts. Thethreaded stud 1 passes through an opening in the brush yoke or ring 17,only a portion of which is shown, the material 18 serving as insulation.A nut 19 and washer 2k) JOC - vided with a central opening to receivethe screws 8, and when one end of the brush has been worn away it may bereversed, so that the other end will engage the commutator. The currentreadily passes from the brush to its U-shaped support, as it is held infirm contact therewith, and by reason of the threaded engagement of thearms 5 with the stud 1 under pressure of the springs 11 a very goodelectrical contact is made with the stud. I may also use flexibleconnections from the brushes or supports to the stud or plate 2, as maybe desirable, when the stud is not threaded. Current may be conductedfrom the stud in any convenient manner, such as by terminals 21 or bythe plate 2 and mains connected thereto.

While I have shown a brush-holder provided with three brushes, it isevident that any number desired may be used, from one up. Also thespecific arrangement for regulating the brush-pressure may be modifiedand other immaterial changes may be made in my construction withoutdeparting from the scope of my invention. and 1 am not limited to theexact construction shown.

It is evident that my construction is one of great simplicity, permitsconvenient adjust ment of brush-pressure, secures good contacts for thepassage of the current, and allows convenient access to and removal ofthe brushes.

Having thus described my invention, 1 declare that what 1 claim as new,and desire to secure by Letters Patent, is-

p 1. In a brush-holder for dynamo-electric machines, the combination ofa threaded stud, a U-shaped sheet-metal support mounted to turn thereon,a brush fixed to said support, and means't'or forcing the said brushagainst the commutator, said means being adjustable along the length ofsaid support, substantially as described.

2. In a brush-holder for dynamo-electric machines, the combination of athreaded stud, a plurality of lJ-shaped sheet-metal supports mounted toturn thereon, a brush fixed to each of said supports, a fixed member,and means for forcing the brushes against the commutator comprising aplurality of springs attached to said fixed member and having theopposite ends of said springs individually adjustable along the lengthof said supports, substantially as described.

2). in a brush-holder for dynamo-electric machines, the combination ofathreaded stud,

one or more U-shaped sheet-metal supports mounted to turn thereon andhaving notched edges, a brush fixed to each of said U-shaped supports, afixed member. and a spring for each of said supports having one endattached to said fixed'member and the other end making adjustableengagement with one of said notched supports, substantially asdescribed. el. In a brush-holder for dynamo-clectric machines, thecombination of a stud, a plurality o't' U shaped sheet-metal supports,the arms of said supports engaging the stud, a brush fixed to theopposite end of each of said supports, said brushes overlapping eachother, and means for forcing the brushes against the commutator,substantially as described.

5. In a brush-holder for dynamo-electric machines, the combination of athreaded stud, a plurality of U-shaped supports, the arms 01 saidsupports engaging the threaded stud, a brush fixed to the opposite endof each oi said supports, said brushesoverlapping each other, andadjustable means for forcing the brushes against the commutator,substantially as described.

6. in a brush-holder 't'or dynamo-electric machines, the combination ofa stud, one or more U-shaped sheet-metal supports, the arms of saidsupports engaging the stud, a brush fixed to the opposite end of each ofsaid supports, a fixed plate, and a spring for each of said supports,engaged at one end to said sup ports and at the other end to the saidplate, substantially as described.

7. In a brush-holder tor dynamo-electric machines, the combination of athreaded stud, one or more U-shaped sheet-metal supports, the arms ofsaid supports engaging the threaded stud and having notched edges, abrush fixed to the opposite end of each of said supports, a fixed plate,and a spring for each 0t saidv sup ports ad justably engaged at one endto said supports and at the otherend to the said plate, substantially asdescribed.

8. .In a brush-holder for dymuno-electric machines, the combination of asupportingstud and plate, said plate having ears bent at right anglesand engaged by said stud, supports mounted to turn on said stud, a brushcarried by each of said supports, and a spring engaging each of saidsupports at one end and the said plate at the other, substantially asdescribed.

9. In a brush-holder for dynamo-electric machines, the combination of asupportingstud and plate, said stud being threaded, and said platehaving ears bent at right angles and engaged by said stud, supportsmounted to turn on said stud, and a spring zuljustably engaging each ofsaid supports at one end and the said plate at the other, substantiallyas described.

10. In a brush-holder .t'or dynamo-electric machines, the combination ofa supporting stud and plate of sheet metal, said plate having ears bentat right angles and engaged by said stud, U-shaped supports of sheetmetal mounted to turn on said stud, a brush carried by each of saidsupports and a spring engaging each of said supports and secured to saidplate, substantially as described.

11. In a brush-holder for dynamo-electric machines, the combination of astud, supports mounted to turn thereon, a brush carried by each of saidsupports, said brushes overlapping each other, and means for forcing thebrushes against the commutator, substantially as described.

